The throttle creeping up is normal, not sure why it happens but often reported on here once it 'thinks' it has taken off.
When you are taking off it needs full throttle straight up to head height..
It will sometimes tend to tilt toward the battery if you go at all gently.
Different surfaces make this worse.

I suspect the sinking when close to the ground is just an effect from being near the ground but not sure what it's called.
Ground Effect maybe
Even so it's worth hooking it to a computer sooner or later and calibrating sticks then doing the Advanced IMU even if it says not needed. I always feel it flies more stable when I know it's done a good calibration recently.

wind, especially gusty wind conditions have slight barometric changes moving past the bird. I live near the beach and it is very windy most of the time. I have noticed that if I am in a hover and a gust hits the bird, it sinks 2-3 feet and then recovers. My theory is that the wave of pressure causes the barometric sensor to think that the bird is rising then falling and it tries to correct. Not sure.

wind, especially gusty wind conditions have slight barometric changes moving past the bird. I live near the beach and it is very windy most of the time. I have noticed that if I am in a hover and a gust hits the bird, it sinks 2-3 feet and then recovers. My theory is that the wave of pressure causes the barometric sensor to think that the bird is rising then falling and it tries to correct. Not sure.

Couple things I’ve “learned” about my Phantom 1 takeoff. I no longer use GPS mode for lift off - Atti only (of course good GPS lock and compass calibration).

Also, I find slamming throttle up too quickly often tilts my bird. Too slow can be a problem too - a smooth, moderate up throttle is how I achieve level lift off every time. A weak, saggy battery will also tend to tilt the AC during lift off.

Hovering a few feet off the ground I tend to use only Atti mode as well.

"Be thankful we're not getting all the government we're paying for." - Will Rogers...

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